California Lemon Law for Malfunctioning Daytime Running Lights

Daytime Running Lights (DRLs) are supposed to make you more visible on the road, but when they flicker, dim, or fail outright, they can create safety concerns and repeated trips to the dealership. If you’re in California and your vehicle’s DRLs keep malfunctioning during the warranty period, you may be wondering whether the state’s lemon law can help. This article explains, in plain language, how California Lemon Law may apply to faulty DRLs, what to track, and when to contact ZapLemon for a consultation.

How CA Lemon Law Applies to Faulty Daytime Running Lights

California’s Lemon Law (part of the Song-Beverly Consumer Warranty Act) can apply to vehicles with defects covered by the manufacturer’s warranty that aren’t fixed after a reasonable number of repair attempts. While many people think of engines or transmissions, lighting systems like DRLs can also be covered if the problem substantially impairs the use, value, or safety of the vehicle. If your DRLs cut out unpredictably, dim on one side, or trigger warning messages that won’t resolve, those issues can affect visibility and safety in daytime driving.

What counts as a “reasonable number” of repair attempts depends on the facts. Often, repeated visits for the same DRL problem, parts replacements that don’t last, or a vehicle spending significant time in the shop can meet this threshold. The pattern matters: for example, if the dealer updates the software, replaces the DRL module, and then the issue returns, each attempt should be documented. If the lights fail in ways that could increase the risk of a collision or make your car noncompliant with lighting standards, that can weigh in favor of the defect being considered substantial.

Warranty status is key. Lemon Law rights typically arise during the manufacturer’s warranty period (including Certified Pre-Owned warranties). If your DRL defect appeared and was first reported while under warranty, keep pursuing repairs through authorized service. Some DRL problems stem from faulty LEDs, resistors, wiring harnesses, or body control modules; others are software-related and tied to Technical Service Bulletins. Regardless of the cause, the focus is on whether the manufacturer had a fair chance to fix the defect and whether the problem persists or returns.

What to Document and When to Contact ZapLemon

Thorough documentation can make all the difference. Keep every repair order, invoice, and service report showing dates, mileage, the complaint (“DRLs flicker while driving,” “left DRL out intermittently”), the diagnosis (e.g., “found fault code for DRL control circuit”), and the repair performed. Save photos or short videos of the malfunction when it happens—especially intermittent flickers or one-sided failures. If the vehicle is held at the shop, note the exact days out of service and whether you received a loaner or rental.

Track communication with the dealer and manufacturer. Keep emails, texts, and call logs, especially if you report the DRL issue and are told “could not duplicate” or “operating as designed.” Note weather, time of day, and driving conditions when the problem occurs; DRL defects sometimes appear after rain, in bright sunlight, or when using auto-light settings. If the dealer mentions a Technical Service Bulletin or a backordered part, ask for that in writing on the repair order.